1970-71 Challanger, Barracuda, Cuda; Convertible Top Hydraulic Cylinder; Each All convertible top cylinders are not the same. Our top cylinders are made from solid aluminum castings which are stronger than die-cast and our two-piece rod allows us to use a heavier, stronger steel. You won’t find a better made convertible top cylinder on the market. The appearance is slightly different from the original, but they fit and function as original. All of our parts are made and assembled here in the U.S.A. Sold individually. Two cylinders are required per vehicle.